scholarly journals Carbonyl halides of the Group VI transition metals. X. Further dithiocarbamate derivatives of Molybdenum Halocarbonyls

1968 ◽  
Vol 21 (6) ◽  
pp. 1427 ◽  
Author(s):  
R Colton ◽  
GR Scollary
Keyword(s):  
Carbon Monoxide ◽  
Alkyl Group ◽  
Carbonyl Compounds ◽  
Mass Spectrometric ◽  
Group Vi ◽  
Molybdenum Carbonyl ◽  
The Stability ◽  
Derivatives Of ◽  
Dithiocarbamate Group ◽  
Dithiocarbamate Derivatives

The changes effected in the stability of molybdenum carbonyl compounds of the types Mo(CO), dtc, and Mo(CO), dtc, (dtc = dialkyldithiocarbamate) and in their carbon monoxide carrying ability, by varying the alkyl group in the dithiocarbamate group, have been investigated. The oxidation of the carbonyl dithiocarbamate complexes by oxygen to the known molybdenum(v) complexes of the type Mo2O3 dtc, is reported. Extensive infrared and mass spectrometric studies on the latter compounds have been carried out. Attempts to isolate the corresponding tungsten compounds have been unsuccessful.

Carbonyl halides of the Group VI transition metals. V. Carbon monoxide carriers and some sulphur and nitrogen derivatives of molybdenum halocarbonyls

1968 ◽  
Vol 21 (1) ◽  
pp. 15 ◽  
Author(s):  
R Colton ◽  
GR Scollary ◽  
IB Tomkins
Keyword(s):  
Carbon Monoxide ◽  
Transition Metals ◽  
Direct Interaction ◽  
Group Vi ◽  
Derivatives Of

The blue compounds MX2(CO)2(Ph3P)2 (M = Mo and W, X = Cl and Br) have been shown to absorb carbon monoxide very readily indeed to form the corresponding tricarbonyls, and as reported earlier, the tricarbonyls may be easily converted into the dicarbonyls. The dicarbonyl is therefore a carbon monoxide carrier. The compounds Mo(CO)3 dtc2 and Mo(CO)2 dtc2 (dtc = diethyldithiocarbamate) also represent a carbon monoxide carrying system, but in this case both compounds are rather unstable. The compounds MoX2(CO)2 btp2 (btp = N-n-butylthiopicolinamide; X = Cl, Br) have been prepared by direct interaction of the ligand and the appropriate halocarbonyl. Although these compounds are believed to be monomeric they do not absorb carbon monoxide.

Carbonyl halides of the Group VI transition metals. XX. Substituted dialkyldithiocarbamato complexes of molybdenum halocarbonyls and their oxidation

1970 ◽  
Vol 23 (6) ◽  
pp. 1111 ◽  
Author(s):  
R Colton ◽  
GG Rose
Keyword(s):  
Carbon Tetrachloride ◽  
Transition Metals ◽  
Mass Spectrometric ◽  
Acetone Solution ◽  
Group Vi ◽  
Derivatives Of

Complexes of the type Mo(CO)2RPh3(dtc)2 (R = P, As, Sb; dtc = dialkyldithiocarbamato) have been prepared by the interaction of sodium dialkyldithiocarbamates with, for example, dichlorobis(triphenylphosphine)trioarbonylmolybdenum(11). In solution the complexes are susceptible to oxidation, but the product obtained depends strongly upon the nature of the solvent used. In acetone solution oxidation yields complexes of the type No2O3(dtc)4; this reaction is very similar to that reported previously for the oxidation of the parent compounds Mo(CO)3(dtc)2 and Mo(CO)2(dtc)2. However, oxidation of Mo(CO)2RPh3(dtc)2 in carbon tetrachloride-benzene mixture gives molybdenum(VI) derivatives of empirical formulae MoO2(dtc)2. The properties of these compounds are different from those reported by Moore and Larson for other compounds of the same formula. Infrared and mass spectrometric studies have shown that our complexes are dimeric and it has been confirmed that those of Moore and Larson are monomeric.

Substituted carbonyl derivatives of the Group VI transition metals. IV. Reactions of some arene-metal tricarbonyls with Triaryl-phosphine and -arsine ligands

1973 ◽  
Vol 26 (3) ◽  
pp. 655 ◽  
Author(s):  
JA Bowden ◽  
R Colton ◽  
CJ Commons
Keyword(s):  
Carbon Monoxide ◽  
Solid State ◽  
Transition Metals ◽  
Steric Effects ◽  
Group Vi ◽  
Decomposition Products ◽  
Carbonyl Derivatives ◽  
Derivatives Of

The reactions of triphenylphosphine and triphenylarsine with (π- arene)M(CO)3 (M = Cr, Mo, W) to yield fac-M(CO)3(RPh3)3 (R = P, As) have been reexamined. Anomalies in the earlier literature have been resolved by the isolation of two solid state forms of each complex and by a study of the decomposition products of these compounds. Tricarbonyl complexes of tritolyl-phosphines and -arsines are also reported and their behaviour suggests steric effects initiate decomposition. In addition, a number of (π-arene)M(CO)3 compounds were shown to react with carbon monoxide to form M(CO)6.

Metal-Metal Cooperative Bond Activation by Heterobimetallic Alkyl, Aryl, and Acetylide PtII/CuI Complexes

2020 ◽  
Author(s):  
Shubham Deolka ◽  
Orestes Rivada Wheelaghan ◽  
Sandra Aristizábal ◽  
Robert Fayzullin ◽  
Shrinwantu Pal ◽  
...  
Keyword(s):  
Alkyl Group ◽  
Bond Activation ◽  
Bond Cleavage ◽  
Terminal Alkyne ◽  
Alkyl Aryl ◽  
Metal Metal ◽  
The Stability ◽  
Selective Formation ◽  
Organoplatinum Compounds

We report selective formation of heterobimetallic PtII/CuI complexes that demonstrate how facile bond activation processes can be achieved by altering reactivity of common organoplatinum compounds through their interaction with another metal center. The interaction of the Cu center with Pt center and with a Pt-bound alkyl group increases the stability of PtMe2 towards undesired rollover cyclometalation. The presence of the CuI center also enables facile transmetalation from electron-deficient tetraarylborate [B(ArF)4]- anion and mild C-H bond cleavage of a terminal alkyne, which was not observed in the absence of an electrophilic Cu center. The DFT study indicates that the role of Cu center acts as a binding site for alkyne substrate, while activating its terminal C-H bond.

Binding of calcium and lead ions to carboxystarch prepared by action of nitrogen dioxide on native starch and its 2,3-dialdehyde derivatives

1986 ◽  
Vol 51 (6) ◽  
pp. 1340-1351 ◽  
Author(s):  
Rudolf Kohn ◽  
Karol Tihlárik
Keyword(s):  
Nitrogen Dioxide ◽  
Alkaline Medium ◽  
Binding Capacity ◽  
Lead Ions ◽  
Carbonyl Groups ◽  
Weakly Alkaline ◽  
Exchange Cations ◽  
Counter Ions ◽  
The Stability ◽  
Derivatives Of

The binding of calcium and lead ions to carboxy derivatives of starch prepared by allowing nitrogen dioxide to act on native maize starch (procedure A) and on starch 2,3-dialdehyde derivatives of degrees of oxidation DO(d.a.) ≥ 0.94 (procedure B) was studied. The carboxy group content of the samples in the H+ form was 4.6 - 12.1 mmol g-1. The effect of alkaline medium on the stability of the carboxy derivatives and on their ability to bind and exchange cations was examined. The Ca2+ → 2K+ exchange was evaluated in terms of the decrease in the electrostatic free enthalpy Δ(Gel/N)KCa, determined by alkalimetric potentiometric titrations, and the binding of Pb2+ ions was evaluated in terms of the activity of the Pb2+ counter-ions determined in suspensions of Pb salts of the carboxy derivatives by means of an ion specific electrode. The IR and CD spectra revealed that the carboxystarch preparations obtained by procedure A contained, in addition to free carboxy groups, a considerable amount of carbonyl groups. During the conversion of the latter groups to the former, even in a weakly alkaline medium, the carboxy derivatives undergo an appreciable degradation and lose, to a great extent, their ability to bind and exchange cations. Procedure B, on the other hand, leads to highly selective starch and amylose carboxy derivatives, exhibiting a small amount of carbonyl groups and featuring a relative stability towards alkaline medium; their binding capacity is as high as 12 milliequivalents of cations per g of sample.

scholarly journals Antioxidant Network Based on Sulfonated Polyhydroxyalkanoate and Tannic Acid Derivative

2021 ◽  
Vol 8 (1) ◽  
pp. 9
Author(s):  
Laura Brelle ◽  
Estelle Renard ◽  
Valerie Langlois
Keyword(s):  
Gallic Acid ◽  
Tannic Acid ◽  
Water Soluble ◽  
Gel Formation ◽  
Ene Reaction ◽  
Inorganic Cations ◽  
Medium Chain Length ◽  
Physically Crosslinked ◽  
The Stability ◽  
Derivatives Of

A novel generation of gels based on medium chain length poly(3-hydroxyalkanoate)s, mcl-PHAs, were developed by using ionic interactions. First, water soluble mcl-PHAs containing sulfonate groups were obtained by thiol-ene reaction in the presence of sodium-3-mercapto-1-ethanesulfonate. Anionic PHAs were physically crosslinked by divalent inorganic cations Ca2+, Ba2+, Mg2+ or by ammonium derivatives of gallic acid GA-N(CH3)3+ or tannic acid TA-N(CH3)3+. The ammonium derivatives were designed through the chemical modification of gallic acid GA or tannic acid TA with glycidyl trimethyl ammonium chloride (GTMA). The results clearly demonstrated that the formation of the networks depends on the nature of the cations. A low viscoelastic network having an elastic around 40 Pa is formed in the presence of Ca2+. Although the gel formation is not possible in the presence of GA-N(CH3)3+, the mechanical properties increased in the presence of TA-N(CH3)3+ with an elastic modulus G’ around 4200 Pa. The PHOSO3−/TA-N(CH3)3+ gels having antioxidant activity, due to the presence of tannic acid, remained stable for at least 5 months. Thus, the stability of these novel networks based on PHA encourage their use in the development of active biomaterials.

ChemInform Abstract: 1,1,1-TRIS(HYDROXYMETHYL)PROPANEPHOSPHITE DERIVATIVES OF GROUP VI METAL CARBONYLS

1979 ◽  
Vol 10 (17) ◽  
Author(s):  
S. C. TRIPATHI ◽  
S. C. SRIVASTAVA ◽  
D. P. PANDEY ◽  
R. P. CHATURVEDI
Keyword(s):  
Metal Carbonyls ◽  
Group Vi ◽  
Derivatives Of

Carbonyl halides of the Group VI transition metals. XI. Dithiocyanatocarbonyl derivatives of molybdenum and tungsten(II)

1968 ◽  
Vol 21 (6) ◽  
pp. 1435 ◽  
Author(s):  
R Colton ◽  
GR Scollary
Keyword(s):  
Transition Metal ◽  
Transition Metals ◽  
Ammonium Chloride ◽  
Pure State ◽  
Ammonium Thiocyanate ◽  
Donor Ligands ◽  
Group Vi ◽  
Derivatives Of ◽  
And Tungsten

Reaction of ammonium thiocyanate with dihalocarbonyls of molybdenum and tungsten(11) leads to the elimination of ammonium chloride and the formation of a dithiocyanatocarbonyl complex of the transition metal. Although the thiocyanatocarbonyls themselves have not been isolated in a pure state, a number of substituted derivatives with phosphorus donor ligands have been prepared and characterized. In general these complexes are less stable than the corresponding carbonyl halide derivatives.

Electrospray mass spectrometric study of homogeneous catalytic system Pd(CF3COO)2-Ph2P(CH2)3PPh2-MeOH/Me2CO-H2O for copolymerization of ethylene and carbon monoxide

1996 ◽  
Vol 45 (2) ◽  
pp. 474-476 ◽  
Author(s):  
Z. M. Dzhahieva ◽  
V. P. Kozlovskii ◽  
Yu. M. Shul'ga ◽  
A. F. Dodonov ◽  
G. P. Belov
Keyword(s):  
Carbon Monoxide ◽  
Catalytic System ◽  
Mass Spectrometric Study ◽  
Mass Spectrometric ◽  
Spectrometric Study

ChemInform Abstract: Mass Spectrometric Studies on the Fragmentation and Structural Characterization of Aminoacyl Derivatives of Kanamycin A.

ChemInform ◽  
2010 ◽  
Vol 30 (2) ◽  
pp. no-no
Author(s):  
S. I. KOTRETSOU ◽  
V. CONSTANTINOU-KOKOTOU
Keyword(s):  
Structural Characterization ◽  
Mass Spectrometric ◽  
Derivatives Of
Sign in / Sign up

Export Citation Format

Share Document